不同碳黑含量PMMA的热降解行为和动力学分析  

Thermal Degradation Behavior and Kinetics Analysis of PMMA with Different Carbon Black Contents

作　　者：龙庆 王传洋[1] LONG Qing;WANG Chuanyang(School of Mechanical and Electric Engineering,Soochow University,Suzhou 215021,China)

机构地区：[1]苏州大学机电工程学院,苏州215021

出　　处：《材料研究学报》2022年第11期837-844,共8页Chinese Journal of Materials Research

基　　金：国家自然科学基金(52075354)。

摘　　要：用熔融共混法制备不同碳黑(CB)含量的聚甲基丙烯酸甲酯(PMMA)材料,根据固态反应动力学研究了这种材料的热降解行为。在不同升温速率的非等温热重分析(TGA)实验的基础上用Friedman、FWO、KAS和Freeman-Carroll四种方法构建了不同碳黑含量PMMA的热降解动力学模型,并将TGA实验数据与求解模型对比验证了模型的可靠性。结果表明:添加碳黑使PMMA的热分解温度和活化能提高,碳黑含量(质量分数)为0.1%时达到峰值;随着碳黑含量的提高PMMA的活化能先增大后减小,其最大提高量为17.76 kJ·mol^(-1),表明加入碳黑能在一定程度上提高PMMA的热稳定性。Polymethyl methacrylate(PMMA)with different carbon black(CB)contents were prepared by melt blending.Based on the solid-state reaction kinetics,the thermal degradation behavior of PMMA with different CB contents was explored.Through non-isothermal thermogravimetric analysis(TGA)experiments under the conditions of different heating rates,the thermal degradation kinetic models of PMMA with different CB contents were built by four methods,including Friedman,FWO,KAS and Freeman-Carroll.The accuracy of models was verified by comparing with TGA experiments.The results show that PMMA with CB has higher thermal decomposition temperature and activation energy compared with pure PMMA.The PMMA with 0.1%CB presents the highest thermal stability.The activation energy of PMMA first rises and then falls down with increasing CB content,and the maximum increment is 17.76 kJ·mol^(-1),which proves that adding CB improves the thermal stability of PMMA to a certain extent.

关 键 词：有机高分子材料 热降解动力学模型 聚甲基丙烯酸甲酯 碳黑 活化能 

分 类 号：TQ325.7[化学工程—合成树脂塑料工业]